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abductor pollicis longus
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DeQuervain’s disease involves development of thickened retinacular tissue of the first (most radial) compartment beneath the extensor retinaculum. This results in pain when using the APL (abductor pollicis longus) and the EPB (extensor pollicis brevis). Use Finkelstein’s test to differentiate between DeQuervain’s disease and arthritis of the first carpometacarpal joint. DeQuervain’s disease is more commonly observed in females.
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